The Secret Path book by Karen Swan

In Costa Rica, amid startling white beaches and hot, dense rainforests, the luxurious world of the super-rich butts up against something darker, something sinister. . .

Tara Tremain has worked hard to leave the controlling grasp of her extremely affluent family far behind. With her own career in medicine, she doesn’t need the Tremains’ expectations weighing her down any more. But pulled back into the family’s orbit one last time for an unmissable party in the jungles of Costa Rica, she finds herself flung into action: a local boy is desperately ill and she must trek for days into the jungle to save his life.

What Tara could never have predicted is that the one person who can help her in this impossible journey is Alex Carter, the man who destroyed her life ten years ago . . .