1. Well unfortunately under current legal scenario the police or court take cognizance of offence u/s 498A, 406 merely on the statement of the wife alone and no semblance of investigation is done to know the truth.
2. Now since the case is already registered then there is no point to crib on it and per contra the decisive line of action will have to be taken.
3. First take bail of the cases as once you get the bail , half the battle would be won. Do not worry the bail nowadays in similar offences si liberally granted by court and no restriction is imposed on foreign travel afterwards.
4. Since in this case I find the wife to have been largely misled by her mother I may recommend you to convince her to reunite. if this is not possible then mutual divorce is best bet albeit in lieu of some money as permanent alimony.
5. Do include your right of visitation of the child in the said petition for mutual divorce.
6. if mutual divorce is not possible then you may file contested divorce suit and do file custody suit to get back your child or at least to get your right to see him regualrly.